Twin tip skis, are skis that are pointed up in the tip and tail of ski. They are fatter then most race skis. A normal mid twintip ski is 80mm-85mm waist. There are super soft park skis, or stiffer park skis. Snowblades are stupid and no one rides them anymore. If you want a good twintip package, and good park bindings go to http://www.princetonoutdoor.com/browse.cfm/4,8202,1718.htm
That is one hell of a deal. If I were you I would seriously think about gettin those, instead of snowblades.